Walking in the forest, the air is filled with a particularly fresh breath, which makes people feel refreshed and excited after smelling it.

"The oxygen content in this place seems to be much thicker than the outside world." After taking a deep breath, Li Daben couldn't help saying.

Oxygen is an essential substance for any living creature living on earth.

You can last two or three days without food and water, but once you lack oxygen, you can't live for ten minutes.

The thin or rich oxygen will also have a great impact on organisms.

After investigation, many scientists have shown that the earth was rich in oxygen tens of thousands of years ago, which led to the earth sending out many huge creatures at that time.

For example, dinosaurs, Emperor crocodiles, mammoths, Titan python, devil frog, Titan dragonfly and so on.

Later, with the development of the time line, the oxygen concentration of the earth gradually decreased, and there were fewer and fewer species of huge creatures. The only big ones still lived in the sea, and there was no one on the land.

Many modern people can feel this.

What caused this is oxygen. During the special training, Jiang Le and Li Daben were tortured by the instructor's devil training to restore their consciousness by taking oxygen.

So both of them are very sensitive to the oxygen content. They can smell whether the oxygen content is high or low.

Obviously, the oxygen content in this valley is much higher than that in the outside world.

At this moment, Jiang Le suddenly understood why the savages could grow to a height of nearly three meters. Maybe they were affected by this place.

Walking out of the cave and into the forest, Jiang Le began to play his investigative ability, looked for it in the area near the cave, and tried to find the direction where the three savages left.

Fortunately, the detection ability of pole a is still strong. A few minutes later, Jiang Le finally succeeded in discovering a few traces of brand-new footprints. Judging from the size of big feet and several hairs falling from footprints, it is undoubtedly left by savages.

The footprints extended all the way to the depths of the forest. They all came to this place. Naturally, Jiang Le didn't give up halfway. They immediately followed the footprints.

After passing through the sky trees and bypassing the rocks, a fire suddenly appeared in Jiang Le's sight. They quickly found a hidden place to hide so as not to expose their position.

"What is that?" Li Daben couldn't help asking.

"Bonfire, there are savages next to it." Relying on his eagle eyes and night vision, Jiang Le easily saw the scene of the area where the fire was located.

Next to the burning campfire, there stood four or five savages. They hung many bone ornaments and held stone axes made of wood and stone. They wandered around the campfire like sentinels.

Before that, Jiang Le always thought that Shennongjia savages were primates like orangutans, baboons and monkeys.

But when he saw those savages holding stone axes at the moment, he knew he was wrong and underestimated the existence history of these savages.

Maybe the other party is not a beast, but a new race with its own unique civilization!

It is a stone civilization that has not been found on the earth!

Just like human beings in the stone age, they have completed the first step of transformation from wild animals to intelligent creatures, and no longer drink blood.

After learning this information, Jiang Le's interest in Shennongjia savages increased several times.

When did these savages begin to exist to modern times?

Where do they come from and have they had any contact with the history of the oriental country?

All these mysteries have to be solved gradually by Jiang LELAI.

"Go around and don't be found by them. The savages carrying the bodies should have gone deeper into the forest." Jiang Le turned and said to Li Daben. Then he bent down and began to circle with the help of the cover of the grass to avoid the savages holding stone axes.

The next day.

The early morning light scattered from the sky, but the branches and leaves of the trees in Shennongjia were too lush and dense, like layers of sunshade cloth. Only a few rustling rays of sunlight could fall to the ground from among the branches and leaves.

"Ah ~" Jiang Le yawned softly, rubbed his eyes and looked down.

Last night, he and Li Daben bypassed seven campfires guarded by savage sentinels. Under Jiang Le's strong anti reconnaissance ability, they went deep all the way without being found by any savage.

Finally, because he didn't want to make his spirit too tired, Jiang Le proposed to take a break before sunrise to recuperate his spirit so as to avoid lack of physical strength.

Flicking an unknown insect off his shoulder, Jiang Le reached out and woke up Li Daben sitting not far from him.

"It's time to go." Jiang Le got up and said.

Those campfires are the outposts set by savages at night. As many as seven were found by Jiang Le alone. This valley is not small, and the number of similar outposts is difficult to estimate.

So many outposts can be set up to defend. It can be seen that there must be some very important existence for savages in the deep valley, so they will guard like this. Jiang Le's goal at the moment is to find that existence and see what it is. Perhaps it can also solve the mystery of the origin of the wild people in Shennongjia.